Pneumatic tire



l. H. COURVOISIER.

PNEuMAnc nmz.' PPLICATION FILED SEPT. 4, 1920.

1,386,599. Patented Aug. 9, 1921.

UNITED STATES JAMES H. COURVOISIER, OF I'OIPIIN,` MISSOURI.

PN'EUMALTIC TIRE.

Specification of Letters Patent.

Patented Aug. 9, 1921.,

Application filed September il, 1920. Serial No. 40S/m6.

, which the following is a specification.

This invention relates to tires and it coin- -prises ay casing or shoe for pneumatic tires having the usual carcass formed of layers of fabric, or rubberized fabric, and an outer layer or casing of rubber, the fabric layers being separated at the crown of the tire to form a substantially inverted arch between the inner and outer layers of fabric, a core or filling of rubber or other suitable material arran ed in said arch, and a plurality of stran s or cords arrangedin said core and extending circumferentially of the tire, the strands being positioned between the inner and outer layers of the fabric carcass to retain them in position.

ln the present invention, l have produced a tire provided with reinforcing means arranged beneath the tread. rl`he exterior of the casing is shaped in the usual manner, but

the tread or crown of the tire is provided with additional thicknessby forming certain sections of the fabric carcass in the forni of an inverted arch at vthe crown of the tire. rlhe space between these sections of the fabric carcass, and vthe remaining sections is filled with a suitable filler, such as rubber, and a plurality of reinforcing strands or cord are arranged therein.

ln the prior art, it has been suggested to construct a tire having additional thickness at the tread or crown, the additional thickness being obtained byarching the fabric carcass inwardly toward the center of the tire, and tires constructed in this manner have been provided with circumferential reinforcing strands arranged in the rubber forming the tread of the tire. These tires have not been entirely satisfactory because no means have been provided for retaining the reinforcing strands in proper position. The strands embedded in rubber have a tendency to work or move and in actual practice, the reinforcing strands have creeped to one side to such an extent that the tire becomes overbalanced and will creep off the rim. If the reinforcing strands embedded in the tread portion of the tire are not properly centered when the tire is made, the tread Will crack on being used.

ln the present invention, l have overcome these disadvantages by separating the layers of fabric forming lthe carcass of the tire, and

extending some of the layers around each side of the arch in the crown of the tire. The reinforcing strands are placed in aller of rubber or other material arranged between the inner and outer layers of fabric, and the arrangement of the fabric entirely surroundingthe arch, retains the strands in proper position.

ln the accompanying1 drawing, l have shown one embodiment of my invention. ln this showing:

Figure l is a transverse vertical sectional view of a tire casing constructed in accordance with the invention, and,

Fig. 2 is a `sectional view on line 2-2 of Fig.' l,

Referring tothe drawings, thereference numeral l designates the section of rubber fornnngithe tread of 'the tire. rihis tread portion is disposed over a carcass 2, formed of a plurality of layers of fabric or cord or rubberized fabric or cord. The tire may be provided with the usual beads 3 and the fabric forming the carcass extended over the beads in the usual manner, as at e. ln the crown of the tire, the fabric is separated into an inner section 5 and an outer section 6. rlfhe outer section is arranged in the usual manner, but the inner section is extended inwardly toward the center of the tire to form an inverted arch. The arch, or space between the inner and outer sections of the tire carcass may be provided with a lling 7 of rubber or other suitable material. In actual practice, it has been foundthat rubber is the most suitable material for use as a filler in a tire of this sort, and lower grades of rubber than those usually employed in the outer tread of the tire, may advantageously be used.

A plurality of reinforcing strands 8 are embedded in this filler. The strands may be made of any suitable material, but are preferably inextensible and 'are of -suiiicient strength to reinforce the carcass portion of the tire. As shown, the strands extend circumferentially of the tire. The tire may be further provided with a breaker strip 9 arranged in the tread portion of the tire, as shown.

It will be apparent that the arrangement of the circumferential reinforcing strands in the inverted arch entirely surrounded by the fabric carcass will effectually retain them in position and prevent them from working to one side of the center of the tire. The present structure produces a ltire of great strength and great durability.

It is to b'e understood that the form of my invention herewithshown and described is to be taken as 'a referred example of Lthe same, and that various changes in the shape, size, and arrangement of parts may be resorted to Without departing from the spirit of the invention or the scope of the subjoined claim.

Having thusl described my invention, I claims.

A tire, comprising a plurality of layers of fabric and an outer casing of rubber, the

inner layers of fabric being formed in the in presence shape of an inverted arch at the crown'of A*the tire, a filling of rubber arranged between the inner and outer layers of fabric and disposed in said archyafnd a pluralit of strands of cords embedded in said filling andfarranged substantially parallel to the outerlayers of fabric.v

In testimony whereof I aiiix my signature of two witnesses. JAMES HLCOURVOISIER. Witnesses:-

ROBERT MOORE,

MEROER ARNOLD. 

